How to transfer & pressurize very low volume of water from a 2,500 rain water tank

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by Pumper, Feb 15, 2020 at 4:01 AM.

  1. Pumper

    Pumper New Member

    Joined:
    Jul 22, 2019
    Location:
    Hill country texas
    Trying to set up a 3,000 gal. water tank system collecting rainwater off 2 gutters. Goal is to collect and transfer rainwater to 10 gph Aquafog, a greenhouse cooling fogging fan that will be mounted high in the rafters. Any ideas?

    Seems I need to run a line with a on demand pump to a small bladder tank and then out to the fogger's inlet.
     
  2. banjo bud

    banjo bud Member

    Joined:
    Sep 24, 2018
    Location:
    South Carolina
    Can’t you just pump it directly from the collection tank to the fogger without pressuring it in another tank? I have a 1000 gallon collection tank buried in my yard and I have a sprinkler pump that sits about 30’ from that tank. The pump sucks from the tank and pushes directly out to my sprinkler heads. No pressurized tank. The pump does the work. It pumps at 40 psi. I was told by the pump company (Red Lion) that even at low volume like 1/2 gallon per minute, the pump would not burn up. Not sure about 10 GPh though.
     
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  4. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    4o to 60 psi pressure wanted, or what?
    Is there a drain pipe in the bottom of the tank, or will you use an access opening up top?

    I am thinking of a 1/2 hp 10 gpm submersible. That size is usually the cheapest submersible. The flow inducer is just a piece of pvc sewer pipe. The purpose of the float switch is to turn off the pump if the tank runs low of water. There would also be a pressure switch and a pressure tank.

    If you had a bottom output, or even not, you could use a different kind of pump that is not in the tank. The submersible will consume less electricity, but you could use a jet pump outside of the tank. Since a 32 gallon pressure tank holds about 8 gallons, your pump would only run about every 48 minutes anyway.

    [​IMG]
     
  5. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    Like Reach says you need a pressure tank and pressure switch. Like Bud says, you can use the same pump with the same pressure tank that supplies everything else. But you cannot run 10GPH without a pressure tank/pressure switch, as that is not enough to keep the pump cool.

    Bud, do you have that in writing from Red Lion about their pump working fine at 1/2 GPM? I know that is correct but would like to see it in writing from the pump company. They usually won't admit their pumps work at that low of flow rate.
     
  6. LLigetfa

    LLigetfa DIYer, not in the trades

    Joined:
    Feb 6, 2011
    Occupation:
    Semi-Retired
    Location:
    NW Ontario, Canada
    It would help to know what min/max pressure this Aquafog system needs. If a pressure tank is required, then a larger tank is better as it reduces the number of cycles.

    Possibly, you could just return a potion of the flow to the holding tank and forego a pressure tank and switch. As @Reach4 said, a submersible would consume less electricity and choosing one that does not have floating stages might use the least. When selecting a pump, don't look for the lowest GPM rating but rather the HP. If you compare two 1/2HP pumps, the one with lower GPM is designed to push water from a greater depth and will have too much pressure output from a shallow depth.
     
  7. banjo bud

    banjo bud Member

    Joined:
    Sep 24, 2018
    Location:
    South Carolina
    I like llgetfa’s idea of pumping it back into the tank. You could just use a ball valve and adjust it until it’s right.
     
  8. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Run the pump continuously to provide 0.167 GPM, to avoid using a pressure tank with pressure switch? I would not do that.
     
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